JMV

This may be a dumb question for you guys, but my '69 350/350 gets a high-pitched whistling sound (loud) coming up from the carb (quadrajet) whenever rpm's reach 3200. It continues if I rev higher and stops as soon as rpms drop down. Doesn't matter whether driving or in parked in neutral. What is causing this? Car runs good at idle and when not pushing it. Also, when I hit gas hard, it seems to flood engine some and then clears and picks up speed. I do see some black smoke from exhaust when this occurs. please help, thanks! :confused:


[Modified by JMV, 4:08 PM 6/26/2002]

MotorHead

Don't have the answer but I get it at idle, hope somone knows

JMV

any guesses??

Kingt

You could use a stethoscope (or just a length of tubing) to try and locate the source. It may be so subtle at idle you can't hear it untill it reaches the higher RPM. It may be a vacuum leak around the base of the carb.?

Or, maybe someone dropped a whistle down the throat. :lol: :lol: :lol:

kenincanada

You could try pulling your carb and tighten the screws holding the mounting plate to the body. Sucking air somewere.

norvalwilhelm

I have the same problem at all rpm. That high pitched whistle or is a whine?

wcsinx

Well the physics of a whistle involves nothing more than an, in this case unwanted, oscillation of the air at high frequencies. It's possible that you're sucking air in from somewhere that shouldn't be as has already been suggested. Or there could also be something stuck, lodged, loose, out of place, etc. in the carb itself cause the air to move in an improper fashion.

JMV

Thanks for all the answers, I think I will start with tightening in and around the carb. It is really loud, almost like a belt screech, but definitely a whistle out of carb area. It almost deafens the side-pipes! :crazy:

Fevre

Noval you crack me up. :lol:

I can rid you of that problem and 460 ci while I am at it. ;)


[Modified by Fevre, 1:39 PM 6/26/2002]